To stop your paid subscription for Google Apps:

On the following page, you'll see additional information, depending on your billing plan. Review this information before deleting the subscription.

Delete user data: All your users’ Google Apps data will be deleted in accordance with Google's Privacy Policy. This includes their email, calendar events, and online documents. Before deleting your account, you might therefore want to export all Google Apps data.

Closeout charge: If you’re on the Annual Plan, we display a calculation of your closeout charge. This is the value of the remainder of your annual contract. As per the terms of the Annual Plan, you’re responsible for paying the full amount of your annual contract, even if you cancel your subscription before the contract is over.

Questions?

If you have any unpaid costs in your account, we'll automatically charge your primary payment method within 31 days after you cancel your subscription. Note that your final charge can include unpaid costs that accrued before your cancellation, as well as costs that might accrue after you cancel.

Note that you haven't yet been charged for any costs that are dated after your last payment. You can also see if any costs accrued after your service was cancelled—just look for entries that occur after your service stopped.